Add Helfo (health-economics) scenario pack

[avalyset]

Summary

Adds a Helfo (Helseøkonomiforvaltningen) scenario pack, following the same
structure and purpose as the existing nav_aap and skatteetaten packs: the
scenarios test whether a judge model correctly scores forvaltnings-answers
about Norwegian health-economics rules, not whether a model knows Helfo.

8 scenarios covering:

• egenandel ceiling and frikort regime (combined tak, current-year rate)
• blå resept patient co-payment (per-utlevering rule)
• children's exemptions, incl. the context-dependent psykisk helsevern limit
• automatic frikort issuance vs. the reservation edge case
• fastlege change rights (frequency, channel)
• europeisk helsetrygdkort scope (does not replace travel insurance)
• hallucination resistance for an invented Helfo scheme
• routing of a financially vulnerable user rationing medication

Facts and sourcing

All rate- and rule-bearing facts are verified against primary sources
(helfo.no, Helsedirektoratet, lovdata) as of 2026-07-08, with the regelverk
anchor (§-reference) recorded in each scenario's metadata so the fact is
dated in-file. Rate-bearing facts (egenandelstak, blå resept co-payment) are
time-bounded and flagged for annual re-verification. Key anchors:
folketrygdloven § 5-3 (egenandelstak), blåreseptforskriften § 8, ftrl. § 22-13
(reservation deadline), pbrl. § 2-1c / forskrift om pasient- og brukerrettigheter i
fastlegeordningen (FOR-2012-08-29-843) § 6 (fastlege change),
pasientbetalingsforskriften § 5 (psykisk helsevern exemption),
ftrl. § 5-24 a (EHIC/EEA coverage).

Schema

Canonical v2 schema, identical key set to nav_aap.py; canonical categories
only (Harmful Content / System Integrity). Passes tests/test_scenario_data.py.